Choose right Exchange Edition (based on the number of mailboxes)

I'm planning to adopt Exchange 2016 On-Premise. I have just 20 users with one mailbox per user. I've seen that the only difference between Standard and Enterprise (server) is that while Standard supports 1-5 mailbox database, Enteprise supports 5-100 mailbox databases.

However, the question is: How many mailboxes will be able to create on each mailbox database?

Hi,
there is no limit in number of mailboxes you can create in database. Main limitation should be size of mailbox, which is going to increase size of database.
If your database goes to have few hundred

there is no limit in number of mailboxes you can create in database. Main limitation should be size of mailbox, which is going to increase size of database.
If your database goes to have few hundred of Gb, your potential backup/ restoration process could be slow. Limit is 16Tb, but I would stick to 1Tb or less.
I guess that for 20 users, you don't need really to worry about that.

For just 20 users, there is no need to go for Enterprise edition.

If you require archive mailbox for your users, then you can buy Enterprise CAL for them, and there you go.

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